Author: Ecomatt
Subject: K & N filter or not
Posted: 25 Jun 2018 at 8:06am
I personally would not bother fitting an aftermarket air filter. The same air filter is fitted to both the Focus ST and Focus RS, easily supplying both engines with plenty of air. For our diesel engines that don't need as much air as a petrol engine will easily supply more than enough filtered air to the engine.
Subject: K & N filter or not
Posted: 25 Jun 2018 at 8:06am
I personally would not bother fitting an aftermarket air filter. The same air filter is fitted to both the Focus ST and Focus RS, easily supplying both engines with plenty of air. For our diesel engines that don't need as much air as a petrol engine will easily supply more than enough filtered air to the engine.